| Company | Location | Certifications | License # |
|---|---|---|---|
| Brown Sheet Metal And Mechanical Inc | Oakdale, CA | Installer (C-42) | 238921 |
| Central Valley Paving | Ceres, CA | Installer (C-42) | 424008 |
| Champion Industrial Contractors Inc | Modesto, CA | Installer (C-42) | 174777 |
| Dave'S Drain Cleaning & Plumbing | Newman, CA | Installer (C-42) | 741731 |
| Garcia Septic + Construction Inc | Modesto, CA | Installer (C-42) | 1070690 |
| Gutierrez Mark | Turlock, CA | Installer (C-42) | 865646 |
| J D Septic Service | La Grange, CA | Installer (C-42) | 897945 |
| Jb Demo & Dirt | Modesto, CA | Installer (C-42) | 1108036 |
| Mountain Valley Pumping | Oakdale, CA | Installer (C-42) | 1112044 |
| N M Construction Co | Riverbank, CA | Installer (C-42) | 775058 |
| Perennial Builders | Hughson, CA | Installer (C-42) | 1036014 |
| Pro Pumping Llc | Salida, CA | Installer (C-42) | 1130364 |
| Roto-Rooter | Oakdale, CA | Installer (C-42) | 604196 |
| Teeples Plumbing & Drilling Inc | Empire, CA | Installer (C-42) | 875920 |
| Thorsen'S-Norquist Inc | Turlock, CA | Installer (C-42) | 688058 |
| West Side Plumbing | Modesto, CA | Installer (C-42) | 1065075 |
| Yates Wastewater Services Inc | Denair, CA | Installer (C-42) | 878366 |
17 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Stanislaus County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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